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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0432c468b30559af49a418340190c813d285e360224494e5c03963c26e375d' 
  AND token = 'NO/4Sua7K1UwB5q3Ot68F78BF41Wlybx+WqL7mqx7nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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