SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33edba725e2f781ff3fb6304260b98c685fb4a302aa2b04c5ac98c5dd3e7fd53' 
  AND token = 'AhINz6TH4wyQ4VjPg8uz7fCXCTGC9CXDYJ/Vtb455aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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