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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e31e984b4f5ea319c5d09a98ba3563c8b7bdc0859307173a09f700a954bae8' 
  AND token = 'Mwjn719uZGkPg/6zQtZ/LptFf59xdE5ap6OPmbKaN/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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