SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c4164bd61129d32df39ae5f93c144b2a022e8a65ebba4a380bbbd796cf627e' 
  AND token = 'GBdDlGfFUzurEp+SF/YLlcLkwvJMgWsH3TlW56L76es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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