SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fb9885b23f2e163ece33b9e33a11f7af04cd8620c2e2367d48b42ff3bbb8ef' 
  AND token = 'JCgbl/UKUqAU+0osMFj2wOhJQMohPhvv0g41bKWAYRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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