Yes, the SMS will send to this contact. The process of sending an SMS is a little counter-intuitive in how it's presented during send setup. You have the option of opting a contact into a keyword as part of the send process, but when you have multiple keywords being used for subscription, this is totally disconnected from what actually happens when you finalise the send and isn't directly related to the send itself.
In essence, if a contact is included in the send audience and they are opted into any keyword at all, they will receive the SMS.
So if you want to only send to contacts opted in to a particular keyword, you need to control this during the creation of your audience (and omit opted out records at this point) rather than at send time.