SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c45c3415986a50f68ee127543e73e879f7c899fbe5b9e4f03d49913eb9624d9' 
  AND token = 'SWGzXot/gdR5FmRVq3wGOomjLvnadeJO74zhBmfRuL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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