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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8d53c61bd962669abe2cab6346f6605a26076f0c7d4ead0633121c441026e1' 
  AND token = 'fK4J/iEKRxX9kXcfLkf1cm2WYh6cw3avvgH+IPNgBj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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