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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a4a19fe6dcd30b990d6a40ec04df5d93c35df0abeb8846a4029c9482a9dce4' 
  AND token = 'QU22a09j55qPjSloBhYlisFvp0eZZaBe+T65m9EcKJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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