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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1464bc91ab488b8fd0a9026e3b4013e39c0a1417f252f32c15a8b905103443d' 
  AND token = 'rdIjhgFpfxFgB+RYsrc6BqDzwSp52bk2ppqnXRzP7e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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