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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083d2e83248d8a84f12b90ff24000d23f8c2932b8a4d0339dc1d4a8025eea402' 
  AND token = 'XtTAKlZ2n5PX9wjPBHq58ozvvFicBoDlnJgMrsN1L98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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