SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3509e93b128db9d83f23a26946032941752f5d2c2d168217b4ce12d56140b1fd' 
  AND token = '+mJxbBP8EL8ZWGodi1O1SKizoSVYuoOj6MJSAFopc/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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