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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c664dfba8e651f1e224a662d193ae5fd08d2286870f88b6b2935200247ba3b50' 
  AND token = '6/9gSK9o7v1g4AyD5kS2shWo2KtCyTTn+RsC7pcAd2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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