SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2eb9274e97b39ac2d7dd6ba91ab37d7710a9b5a7a81ff63fb1e1a49043a35c' 
  AND token = 'zeefJZbhBf5CmPlDZZXfKch/qwQLBA9fBj5GoF9kv2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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