Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5373c1546a38bbdee0aafc0b6804d85acf7981db249ac4b34934989fb04a5d19' 
  AND token = 'Swdxv/8ZtIH9x3ah6Cmv1GkGzJOZi1Mh1RNhhbT17gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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