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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085f91c0d34df1727abbafdd2eefd5ac2ea86daa31382da9f41ba6b8982bf5b7' 
  AND token = 'GNL25mehn0/KiVwAp9Kh7WaTezcEHuPX9N4nDzBpp2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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