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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b59749628088d9789e6a96346b633f41f970452e93c39c7cce1738a42bab867' 
  AND token = 'SsjSA06jnjGHmZuBQ27hTKV5dA9odc9URj/cYafMS3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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