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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d543fa1fe039e7349e4c7700b1a8a69d85d818e492f371468edc0c9d7b9f29' 
  AND token = '05B3lvc72SMgYsWXpNXjkGUFKrv2u9kQeIlfef5+rx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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