SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff053fe2320786a2131024ec115e2b0eb585245747a7a6dfdf2f9f1964b93fb' 
  AND token = '1lesofJKyr28v5qvTwUrHuY6BWK4G3CuP+jLM1IB10w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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