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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14749fe48b72591b480268c7d6e4719e54624250d3f5f1c971f71f2ed1fef28' 
  AND token = 'MlUoAycAKLiYRcpmMwu+9WfioF+0CMyM58EItNCEWeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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