SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66655d67fdd74fe85edabe3f7ccbb98b5c575f7d95e9b877caf073046db5bf1f' 
  AND token = 'bGK5jjGRBtmefF4TUzMrHhb//sAE+tu+RKXoYOESZNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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