SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964fb5f4e3320626c4d9f2df72222f5bb1b419ea08d5e1d157b0e78411c1783c' 
  AND token = 'i0G59w5NSGU64wFjFZdXKAuQJsIO4y8po0hUVBvhL3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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