SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3635ccc288c95f688f7db59b9eef16a056f5763dd0dcecad3bb41b8492798a1d' 
  AND token = 'kV6GBMNYgGd/k19yx31KqJTZTgPVejIus8uqi8uqZNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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