Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dd544cee2dc8cca3f907f9c19098a0b8cc8f03a06c37b857d0cbd5dd54d799' 
  AND token = 'vZUREM8A3Aq9JWEQrVQgeDnCHhJbTGkteH+lVqonckU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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