SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8b55a4f8d9825cda72c905fe677c7a82f1a61437bfa33a55b144d6141c4b88' 
  AND token = '4ZKgwD50+R/OGKFGZoaJkblqVBQbpBne16zcS1aIKis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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