SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b6bc732377bb1f22afcbe94954fefcabe080a10e7cf200b86059855a68d655' 
  AND token = '3XsUg7ZspQQ/9DFKqWuDApZBmsknLM52s81x8KY9vhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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