SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88f91428dcf109741e5a44a1c95c458617ce6dc3e2a1ccbc9fd3c8c8613db91' 
  AND token = 'sJSIZDm8jTtDKWY4SbCyPvW8wjTz3231kJL+s7kOj9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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