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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce19288596c83f04209bfe62c14946cee391e03c8dd2290be168400e99b6a66' 
  AND token = 'h0zZEbx1SJ4z5kCs8+LolEQkyPctm9Jnus5DI50HlRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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