SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33b8e0300906442f60520beaf3b1ef2f5cef4a436dba014d44c23db0c18055e' 
  AND token = 'WhYwo5PluY55m/zK4qneVuVmWPNjOVXTt9om0lkp4xE=' 
  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