SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe171666486b13d7bbafb39fa141789204393e35669b4e34d5b2881f90089ce' 
  AND token = 'Gv5VMnn13Fo3e/JJjl+DQVwf0FB1FbmOtBFq+2miF/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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