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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb76333f0cd7acb8f99b374758462a46976360d9f1053c6e4aefab23963abf86' 
  AND token = 'qX/jDKVhMNyT4ZdFdZNtMaek/T+eYz5+B/4MTzP6lyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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