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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30684050f28c9e3bfcd9d00d1037b0c8b8c61156d0ab9ec765443dcfcef2ea8c' 
  AND token = 'ORYpump2yxJYkUh9SifLS6/2zA6gy4292mZdi1B/mMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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