SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e695df3d12bcd2bc7b0a4b41196c8fa8eab57ca29557dd95ade9c630099418dc' 
  AND token = 'W70mOhSF3PSNTR+ICb3+AQv12N3uJBGpXjtJgGRJ4Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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