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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aae7bf34fdedfdb3a20854b9a411394ee0c1e960f93eccfb4492838d10ed935' 
  AND token = 'qCkklSakOdq9dfjb/v6AOMNujLjHjJ9M0RG0HmYcJpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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