SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2809253f492ba6edac0bed8cc4dd748dd68abd0512cb4c7f4d96f64fcf41afae' 
  AND token = 'gJMnePfyvW/Lhz8UsZCgUHKG9EKQV3odTCkZe4VqY2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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