SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6368192b28be13710ea2ca7615a841c28d9cd3266b3e957be7e4622b8df62a5d' 
  AND token = '70uLixJBb3PTqvNyuY7K+lCnvwZkkXFVFvMicMObeiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables