SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418ab5b62eb1452f87db50d5dd114f1e9b87f7501761c6c6c1e95cb57a18920c' 
  AND token = 'GQPljLPZzCmYEJ/l6xWdqRJaumu4BfbYdx8GscDYUvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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