Usually a rack system, be that with or without the lids on the tub, will be more secure than most locking tubs.

I did find some locking tubs at Target though that seem to be purpose made for snakes. This is an example. This style comes in many different sizes and worked great as a temporary home for my ETB. It quickly became my favorite snake holder/transporter.

https://www.target.com/s?sortBy=rele...te#sn-51872701