SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225b6b03502edcdc83a1ae7f6d205965f0ff201eb9c62c3642456719d5553b4b' 
  AND token = 'hLxdmBGWW9AS7tg81mEqeVR5TlkWg3n/XlzIK/XwY0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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