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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1597b3f00b8b0d21995dde3daad982eb084d81cb634aef67c7cb6faee9c697ee' 
  AND token = 'UmejnarYx+e/zhTc7K917WVyABF3vShPloGPq0SlqHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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