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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6b8061293d7eea9ef157c5cb16ca889f129d615e88e447689cc68eb0e58227' 
  AND token = 'G/uDDKw/zInf5s0HrML/xCAF/6QDdXj4AmVbjQx/7P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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