SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89953cde995af8178edcf9ff95c4a8eb1707539ed0a2d689ee15a2b376b1862b' 
  AND token = 'bejNWgJ1LVzYS4aaSvRmdWnxJioiMWI/+tlzZCV8K1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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