Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f93ced90963f92b4d5dc4fcad0263f2a36d0ebe3a0f7fb999a08e2e6ee8cf3' 
  AND token = 'AeY8Lfm4SAM4sXbFxhLhUk0lN/LqIFhck9UkrIrPJI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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