SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1e22040a151cc4c32f29ad55da6c982184f7eee1f93a53ea02f0bdba685984' 
  AND token = '79PY4K+/GNXAIkA2A4H/rrrGpvZqu6uq7fCJCGWj1JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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