SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6085bb31d292e273df08a4fa6dad46b812e178384403eb86f62779c3322dd1' 
  AND token = 'lST5Z1ad2b9GDPEURXhuAsPpvws+A6w/rvq1g6opoJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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