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Each minute Smart Watches are becoming more popular, however, there has been no way to secure by locking screen. A developer made an app called Lockable it is available on xda-developers, with the provided app you can secure your android wear devices with different lock screens.
Android devices may be secured to a variety of methods - from a PIN-code to Face-Unlock. Individually Android Wear, however, offers no lock screen. But no worries this app allows you to lock your SmartWatch. The free version offers you to add personal swipe gestures and it can be bought via In-app purchase you can use then to various function such as expanding a PIN lock or an unlock pattern.
I personally find this application very interesting. What do you think guys? Leave your thoughts as comments.