SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f3075f951a547cc6d9d295634c08238a00314692cb6e40ff116684fd2b3ffe' 
  AND token = 'qHRr5nK+0AH0vPhIKjeh1G5Tgv89F1lGjt0kDbJAYwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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