SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534a266fff363ea4d4df3923e68a43a9a8a4463b3acfb49569957d05184ac622' 
  AND token = 'DkEL0bZEocAXFNmkZyz7zv9GhGigR5zJmgCgGjAVVfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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