SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aaa86583a44c926b2097165234be24ed9e2dbff0fe531828f8d52bcd33082b7' 
  AND token = 'hVeRD9dv+dNMLGtFSgJjxIJVXKhYMEC++YoXCK27n4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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