SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba48f6a57d8897eb129ccf5dfe0a63aedefaab489bd4376142203eae8d7c3b8' 
  AND token = '2VURDQdpBJSq96sBslgCWuUbmOIG6KFXQ/TTcpchicI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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