SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eedf02cbd24c56fb5e6312ea66caf00fa4223fd76fc404915692f72137855927' 
  AND token = 'YRpOvKog/2Dj9G14njVCJsr8E8OOtpeWgGkpD5qQ7+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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