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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679fd3c5f722ca480f8cfc1602450f26c20770bb0e790b6f22f56f62df17bb10' 
  AND token = 'L7CxNxA+Nyjb0SoqyVcGa0XGmD2TXGQ5rsGz3Axet8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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