SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d1c7560b75a98b9242e18d1eb7fe67517316b8a4e73463a240d09fd532da85' 
  AND token = 'XzmQ2vx7mXhirrq/rCa0fjBQu61wjqANqDceTsJOgPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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