SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab6b4528bc4a159886c00d3497f9f32a7575615309f5c5e1bcb75311125dad9' 
  AND token = 'zPRVXEDthYZlXURO9vZBy++FAmaCA/MjwKI3kqkWt84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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