SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc6c59df41d8abe7d5c12073bf0410b393c7480efcc49284d69cbd875d6204f' 
  AND token = 'CO5E3vAfR+Kuqg/AkG82Ezuhk1D8pKrpejYqynrlojw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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