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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f93177423b379fa12375336d548d85f9bb5bb93e9e74adfaa8d03b1f2c5c41' 
  AND token = 'HRIrD5h5jfKYxJVqM5P1kkdabr0evBiAjOpWd3u4exU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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