SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc488098e324dcf3a8aa38668575de8291b0768eb7bcf0ac76d12495f5a47d4' 
  AND token = 'oWSzTzZ/ZzF0HxXvsjIuQEJhFJJCEjQeSK0w8hF67go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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