Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f9320140fe5395cb70e276125a275b43a31819735a5edf3bbcce6ca0836359' 
  AND token = '3G0TgJSeXbV0rpXBDH3S9+vsHs3uXEOVjyZxdxIBs/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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