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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e01dc4e17b4347620d3995292e2b5cea2120a7cf70ce66a07c677a89c7d36f' 
  AND token = '98lv9pUhk1FkNzfJfsfWYLoX0vfikvNp7e8hrtQeF0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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