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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea5f7084d718093a105ae63fbc968928423c12dd3125f20c58529629f4cddbc' 
  AND token = 'dsWrQA038sSir587ToZunh/u9VeyWt3hFI2eVv72lX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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