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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304e4e258b9cd3f328682f84e993a19174a644c35f8873749c3c86d5d80e3d4f' 
  AND token = '1ZA/oeBZH/QHClttOUV8JJaYvVtEYc8Yut17+7Iu/Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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