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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc0688451db527055370622e3fdc2162e3aa96f579924e6f4e0cdc16b34e1e7' 
  AND token = '4eEig03rQSjXlkimINLk8ZreFqHdHaFwUC9ydOkilv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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