Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d6238d5a4fc8afc6d1dfd30bce7697fef46e61b870befc1fa58185c6b99517' 
  AND token = 'Jcs5aaAdiKAq+2v8JRvnYT4GVcG5MS8JjA8cfdiQHh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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