SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf72b67646d605ad6e6ceee0e9223733dbe03fb811c5934a551fe5ccf8d51da6' 
  AND token = 'bQ+z0OHtFjw1NwDUYub4PmMYVPJqeBVV0B/hktpFtk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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