Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539104c9ac30243265024650ebe6da727d701c169491c80a6d27c37e9162814c' 
  AND token = 'NsGqTf+RxRy6WpprXYOrZqRsNM6YLBDdkR5m7kGs4p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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