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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0028dd8f016200dc950caa96cf27d11d530224b8ee79089e3a5a4fb74e39d250' 
  AND token = '/PIaiFEBYT88FVx5k2xkM/Mq6MzHSiuqTe1kmLDFJM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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