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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f644eb0179a0b6b08aa9b72a87ef40030671e8ed8747074a443f6b1db5fc4bfa' 
  AND token = '/NGNSXyHcFgpEC3ZYLyJsXVbrF/E604VNjYr5hMpCUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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