SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a164f082a5fc43b1f3bfb78267b6842fbd4458abab95b9cc437ade7833ff4e' 
  AND token = 'mJYH/ulMz0g33eOTGYJ8QWKhNqztxCbd1PerVvzz608=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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