SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424be0aac555a3542c1439fd9a4b6096f1d3552fee8b56a77a2af9584532a9b2' 
  AND token = 'KdiUsmgTHAygEt9/pwpBCDPkVlDQjeobH+Cx9Z8W4hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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