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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba0c1eb40bbdf0e59dd2b4d994bc82ac9bdbc97c592f3229cbf84c5c9629e20' 
  AND token = 'zM+tdgxlLnViLgkf/ktaFdaZSVGXTihB9FC/x72vlE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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