Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0851cd6f10a49ea62770aa1bb7815cf28200b3fec9d92032787a4f4c9623b2' 
  AND token = 'iLy7XoczFUVuuYsvLR+b5DPzaeh8c/1QcJtIQQOaBhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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