SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b82b61975d5d87bd934068ebe1c4774546e94582cf407caa5d45ec25089d832' 
  AND token = 'yIBFfSjIIW9fzwnjIPZRsv0JwYSkIZ+NlUX2hk87biU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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