SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60eec23320c7a287ac1597e33023c33dfe0055537701a690834365e9e068820' 
  AND token = 'dx6LF+eTUJ0N/81sqkf4rZjTxYbOiqxK1S8xZYg5kps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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