Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051f142ef5866f486ffa60beb403968d79d8fd4c626b6b6685d762da7dd2ed53' 
  AND token = 'UdiiZ6KNqlwDRykNC3N3v2s60voePMZiAmmKqWj8+NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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