SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b11a972bf34a08ad3bc8b032f22c790768ab7295ec2b8e4614bfa759fe8c793' 
  AND token = 'Iq58Yvvjt25lwgX4By7pZO+XhMW+A/E1FhPRAMce+2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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