SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938dfbd2d338537f30e56671fab8f5c68c84dfd77dd98794c953f19ccb103a01' 
  AND token = 'vZP+lo/+TKmkTNg08dahhIsmUDZNd4h48BJ5Dzj047I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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