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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e2b98c47b1a905554a146ad30270bece9575885647cced0741b217242731a3' 
  AND token = '7or6GBWOsH12EgYigW4TVob5wKn4KMLafHFzgX91ZJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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