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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf919c24c0ac31459d8da5e98ae701ff2e30d8a6eb3d308eb4f1ddbdc5ec156' 
  AND token = 'Ha75cB8EUpWYjrZ8mofZU5sFHGP7kz9Tg3ZHWCrT4xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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