SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafab2ab1cb17fe58763b958e458563b6ca8dabcf3004be562019186db8c0d22' 
  AND token = 'tvK8NxXy7sRb+1yfY2o0XVhnCjmXq8zNnZFyaW4gBXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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