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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702ca778fb6e614fd906afda7847accd0662ec48b6db4dd09909a4f2e2cf5580' 
  AND token = '1PornY/KaZWcO+xAcaQL44WqPT4XXFhiWNfb/1W0ebQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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