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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f1fc57073740e199edd1e5fd37ce10a61020d97ef61241c5392096ee064cfb' 
  AND token = '24IfnDNKlhfvWGObYS4OLGfPVErU4aARpy0DGRA13iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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