SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30117a8e1375be06b16243396e05a27ef2e9b82f95ea0bf551ab69842cac33ad' 
  AND token = 'zZZJX6gcxH+TDo+fFPY2gSLoAEVbE86qqh/NQxtt2jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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