SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528c8f2279fc39a76c13e468a25cd894e4165d41b7f058438c9583178d3f533b' 
  AND token = 'CfYcIfXTJTvJBQANo9Xyyq0fNBIhSCbZzjeoGh7Z5uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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