SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ed09324249e15ee3a75d8314907f7364b14c5ac7c4b437a85e0bff9496bb04' 
  AND token = 'mho6ASbhqLJHTwZQ49vm0B8jsuicVIMzK3xkRJE0ElQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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