SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faae647dedfba1d4a366b3cec114506e15a971f5ef7e3c0019f9862f219b2a59' 
  AND token = 'wsYQXMzVf5jYg1J8xDlcUrmHqeB20LbxACEjwMZL2kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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