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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae1b92fede027c95c4e9e68d96fa9b7bf093568cbc6ad8acdc1e1826e03ace7' 
  AND token = 'I6K0agjqoyvF5MkTv7sv/0WsGFpzK1TYfmNiogn+h3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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