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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee33de73f72d28f81907b57de47fdc6bfcea14ab73d2838e3a2e5a6ebea5bce' 
  AND token = 'TBFlC5/DXXH9xKONwL8zPSste9arquRTs5LqLcssEh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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