SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e329ad4dd70b94b24fd6f791fd89b256e1d7e0a792cc301b7d7469c6288a14' 
  AND token = 'zpz36jsGA3a3nCV2mhZG8Jw1kFFt5Q7nrE48Llgpf9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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