SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d64cb5b27d8ce330fe2a62cfa5ab7b20ac5cd85ba7d84d53a569cd30db957d' 
  AND token = 'vfoGUQvUKVz3RPR+2T6HrnIpBZcfa+HxmKJriXLOvFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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