SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b7d3117c8e6f12b7163902b559e84491c540f6703d46ae3ddbde4bae53cc8c' 
  AND token = 'yl8JHaWcofPjUPqQiGf2U3VLtcKgCjUzLXt3Y4LWQ+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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