SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f518f48cc9c4bf9b43f1be6b63a6bd7eff37caf46a9349579acbc7066247f2d7' 
  AND token = '5+LjyRJoofqhz/mRz+YFgGtSuPQyX5AsKfuXWhQHDKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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