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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99dd1e210c3f7161d63342bce2d9016e343cb4b88c65075f3b493ef0e65fb72' 
  AND token = 'fnaUbuknISYp1WM/u3m5uI99si9F5j0g0W7qQkvruQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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