SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee151edcaa64ebf3448820c23ba9a2d966233319fca8d52f2540b80bd84689e' 
  AND token = 'CJHbKOlS6W+OdivXvgURauBgvZxVn+hB9x5q8d6TppI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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