Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8ede88c305cb76f80b31b7acb690df482c0372f79bedc26bac256378b81ec4' 
  AND token = 'JaM//d2zLeFDTQBZt8Sp7KAA0pQDxWXuXNgFXWzxDYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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