SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e8a8813695114817bd179790092829d512b8c1f5092d82654b16c5fff8e0fa' 
  AND token = 'GOCCNP4uV+9KARK+kZruxvmUJcs2j5wetz+T4PC1NUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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