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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267aaed883d291dbc3de15d630a727631e6e56c83d42e87d8752a036ab6d5b7b' 
  AND token = 'Ydc6O9H7uax0yi1o9Ho+ZpFcbFWAHXAiVc4nK1opxC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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