SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89c5a41bbda2c48e459c28611f2f3f731ceb6ba6241f453e2c568a88bd8f5cc' 
  AND token = 'PfAYe71VX+NsufZN4O2ZxHWbjno6t965QlVpGQBPL20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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