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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3471672b1b72cfec562a27f6d223d645cf4689f39184ae7200ed38ef42fe143' 
  AND token = 'aWMtlPCFbdkq220LmeQirmT+7WTw/Na6G8p6YOncTNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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