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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f39c6cc50979e3950b75f6a97e9596adf95ef6bd858e1ac4b6ea79a9e28daa' 
  AND token = '0clGtJpmNDBFslfNQhem6IjNm7YXAU9AnYZ16DF8cRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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