SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bc973fd36cbf64574cdf70a8db2dd1353b8bb9128c328cf6043f37a38bce34' 
  AND token = 'hFqzWrVlGXzX/gPufoySjhf6Hm6Iblc/nE+Y3Md8OPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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