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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b15e6bd1cd519c9125c9ae5699802671999da4cd9f45d11fd9397e32c8684d' 
  AND token = 'NBnIvcxzIFhVsKipZBQR9oUQagB34NksQFv5uaOTxbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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