SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d56500485ca5ee0efdfc06633c87f93bdd67827c69b14dfa5794c7834cbc14' 
  AND token = 'sTa3H03AGJ+7IUTqOIR5gvLzRgSyCDYpH/foVJv0qJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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