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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ab42dc0130ee2eee0cc719acfec5fa90f5b9de33448ea09b36e8105a6b6114' 
  AND token = 'J/QMbfrR4xj0OH9DuN/Ru7G/Krd/xMwYybU18mIC92Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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