SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c327185f544ab4e5fd3130cb44c6bdfe68f29694ab91d805d1f4f7ee2f0218df' 
  AND token = 'SuXlmiKNOq4yQeZjQm++oUYgKMqNIVJA6OqZiKndGbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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