The window pane in your example photograph is wide enough to allow entry for more than a gloved hand; an entire intruder body could fit in the hole, should the pane be wholly removed. At that point, the lock becomes irrelevant.
Moreover, for safety reasons, chances are that the unlock mechanism from the inside must remain operable without a key; otherwise, someone could be trapped and unable to exit in a swift manner should a fire occur in the room. Under these conditions, there is probably no lock which will ensure security (or even simple improve security by a non-negligible amount) as long as there is a breakable window large enough to allow the "gloved hand". Also, note that an intruder who is ready to break a window could also have a crowbar; a wooden frame won't last long.
Therefore, I suggest that you do not look for a lock but for some way to reinforce the window itself, or for a deterrent (motion detectors and alarm in the office; armed guard and/or fierce dog on the inside or on the outside; additional protection layers, e.g. a safe or strongbox, for important assets in the office; and so on).