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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409ec4127043b9049ccc8c6a06d11700ddedbd3c2f11b077c181abe522f1ea7a' 
  AND token = 'X0orCq1bY0WbtaXa4bcTazypP+/enHYa8+w/vuwJtC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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