SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d719cc2c69214c26af06df65d7f7442fae869810d9b07e9c38b8435900f718' 
  AND token = 'uZ7jGas6xYhLywmhvNnNY0wRpOWJ6w+FXiD85oUsATU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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