SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa726f0edf96b84f97ad2443e83397212b2c7b0731db925cb91179268260fb0' 
  AND token = 'b5yXVZrPonY4pRsX0l++hlTShxqOQQRaPhqKAjpvvLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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