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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96cd4087fcee5a7ef81038c1cc14032ad4a0af9cc5864001e5fbf89e265a55b' 
  AND token = 'Yg+ryjo6FJpXwo2buqYqoqJnkcB5UOWWY1CEetvdjSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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