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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bac4b5f7907e69a32f6db7d4ad22b7d9175890bae60e5ffcb32dd7721c906e' 
  AND token = '/sDwdb+HfCnwmqSL6PMAldcM7Vi2ZuKvsKQeSyG99co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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