Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1d2ba082a51dee15d6b8feb92dadd76815888627a079984f7ea98dd14c59ae' 
  AND token = 'JCXzfWsw8rS3bGEWqrg7dNhZkrun+dohbf5/adJpT3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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