SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057d09d751d7884fa36cc3a693d186f7c51ba7999495b7a6184d9ba6be2060eb' 
  AND token = 'M3LJw+zqyCNNeFdCUlAFOOLv3TZT2pF/XOhVWN+RtiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}