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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88346b03f39440bd13dc5565f7e9ac3697fae5f31cc5d367e8cc985d47af8c96' 
  AND token = 'ut1hht3qHcqoPEd9z/vxDhzd9e+9lnTSX+kniWaEZ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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