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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f87577609c41e62ac9331208bebf05b511bc41e3617a6ae6b1821d3a4bbd37' 
  AND token = 'sI7phxTGG0FNLaB5X8DeqHrIEuyIQcLl6kDlHKS/t9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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